Recognition Method of Mechanical State of High Voltage Circuit Breaker

Abstract

The invention discloses a method for identifying the mechanical state of a high-voltage circuit breaker based on the feature extraction and feature selection of the contact travel curve. The contact travel curves of the high-voltage circuit breaker in different mechanical states are obtained through a large number of opening and closing experiments, and the calculation [min / Closing time, opening and closing speed, and average speed] are determined as the three core features, and then the contact stroke curve is discretized with equal width, and the stroke value at each moment is taken as the feature point to form the feature to be screened; calculate each The mutual information between the feature points to be screened and the fault category is used to represent the correlation between the contact stroke and the fault category at this moment; the above features are screened according to the maximum correlation and minimum redundancy criterion, and a set of optimal Eigenvectors: use the optimal eigenvectors to train the support vector machine, and perform state recognition on unknown state data. It makes the state identification more accurate and perfect, and provides a reference for the analysis of the opening / closing process.

Description

technical field [0001] The invention relates to a method for identifying the state of a high-voltage circuit breaker in a high-voltage power supply and distribution line or a power supply and distribution system, in particular to a method for identifying the mechanical state of a high-voltage circuit breaker based on feature extraction and feature selection of contact travel curves. Background technique [0002] High-voltage circuit breaker is one of the largest power equipment in the power system, and it is also the most important switchgear, which is responsible for the dual tasks of control and protection. Therefore, its performance and reliability are important factors to determine the safe operation of the power system. [0003] Since the internal structure of the high-voltage circuit breaker is not visible, it is difficult to intuitively know whether the components in it are in normal working condition. However, it is impractical to measure and analyze the internal co...

AI Technical Summary

Problems solved by technology

At present, the travel curve of the contact is generally used to identify the mechanical state of the high-voltage circuit breaker, but for the contact travel curve, there is no set that can reflect the entire The feature extraction and feature selection system of the characteristics of each stage of the opening / closing process, so the present invention extracts the travel value at each moment as a feature, calculates the mutual information between each feature and the state category, and then finds the optimal feature vector. Unknown state data is identified, and the moment corresponding to the optimal eigenvector can be considered as the key point that needs to be focused on and analyzed during the opening / closing process

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